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中文摘要：
为了解决现有基于身份的代理签名方案在随机预言模型下安全而在现实环境中不一定安全的问题，文中首先定义了基于身份的代理签名的安全模型，然后设计了一种新的基于身份的代理签名方案，最后在所定义的安全模型下基于计算Diffie—Hellman假设不使用随机预言证明了方案的安全性．文中方案仅比最近提出的一种高效的基于身份的代理签名方案多一次双线性映射运算．
英文摘要：
The existing identity-based proxy signature schemes are secure in the random oracle model but not al- ways secure in the real world. In order to solve this problem, a security model of identity-based proxy signature schemes is presented, and a new identity-based proxy signature scheme is proposed. The security of the proposed scheme is then proved based on the computational Diffie-Hellman assumption without using the random oracle heu- ristic in the presented security model. The results indicate that, as compared with the efficient identity-based proxy signature scheme recently presented, the proposed scheme only needs an additional bilinear mapping.
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